ttyllthyx8456 ttyllthyx8456
  • 01-08-2017
  • Chemistry
contestada

20 g of nh4cl is added to 13.9 g of water. calculate the molality of the solution.

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Willchemistry
Willchemistry Willchemistry
  • 02-08-2017
Molar mass NH4Cl = 53.491 g/mol

number of moles solute :

n = m / mm

n = 20 / 53.491

n = 0.373 moles

solvent in kg :

13.9 / 1000 => 0.0139 kg 

Therefore:

m = moles / volume

m = 0.373/ 0.0139

=> 26.83 molal
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